workaround race conditions during `PeriodicWorkScheduler` registration (#7888 )
Summary: This provides a workaround for two race conditions that will be fixed in a more sophisticated way later. This PR: (1) Makes the client serialize calls to `Timer::Start()` and `Timer::Shutdown()` (see https://github.com/facebook/rocksdb/issues/7711). The long-term fix will be to make those functions thread-safe. (2) Makes `PeriodicWorkScheduler` atomically add/cancel work together with starting/shutting down its `Timer`. The long-term fix will be for `Timer` API to offer more specialized APIs so the client will not need to synchronize. Pull Request resolved: https://github.com/facebook/rocksdb/pull/7888 Test Plan: ran the repro provided in https://github.com/facebook/rocksdb/issues/7881 Reviewed By: jay-zhuang Differential Revision: D25990891 Pulled By: ajkr fbshipit-source-id: a97fdaebbda6d7db7ddb1b146738b68c16c5be38main
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